Spark-plug



C. F. MEYER- SPARK PLUG- APPLICATION FILED JAN- 28, 1919.

vwewto z Patented June 29,1920.

srsrs iam crews.

SPAEtK'PL-UG.

specification of Letters Patent.

lfaitented June 29, 1920..

Application filed January 2a, 1919. Serial K0. 273,636.

To all whom may concern Be it known that 1, CHARLES l MEYER, e citizen of the United States, and resident of Bridgeport, inthe county of l airfield and State of Lonnecticut have invented certain new and useful Improvements in Spark- IPlugs. oi which the following is 2i specification. I

This invention elatesto improvements in spark plugs or igniters for explosive en-' shown in hi Similar characters of reference will be found to denote similar or corresponding throughout the several figures of the accompanying drawings forming a part of this speci cation, and upon which- Figure 1 hows central vertical sectional vicv through my improved spar r plug completed 2 is side elevation of the plug Fig. is iletached View of the two conductor rods shown positioned and con-- nected in 1.

lis a. plan view of the blank from which no telescopic spring; socket is formed, shown in Figs. 3 and 5, and

Fig. 5 a bot-torn end view of the spring socket as seen from the lower end of the rod l arrinoin detail to the characters of lelcroucc iuiurkod u pon the drawings, 8 indi mixes the metal casing of the plug: and 9 the closure cap which is threaihibly attached to the upper thrwdod end portion ll) of the casing; and which serves to retain the several. internal partsoi the plug in position. The lower 'ieri 'iheral poi-thin ll of the plug is also threaded in the usual way to permit of its attachment in the threaileii hole of an engine cylinder.

The central chamber 12 within the casing receive the large end portion hop-e porcelain i l and the annument is? of the lower porcelain 16. The lower end of the upper porcelain is seated upon the top side of the enlarged portion l5 of the lower porcelain so as to better retain the parts in a fixed position. The lower porcelain member 15 is provided with a central hole in which the conducting rod 17 is seated. The extreme lower end of this rod projects out from the lower end of the plug to form the sparking end that acts in. conjunction with the end 18 extended from the lower end of the casing. This rod is provided with .en elongated head 22 as shown, the sides or" which are engaged by the yield-able spring jaws 19 secured to the lower end of the upper rod 20 that extends through. the porcelain let and to the upper end of which the binding nut 21 is thread-- ably attached.

The special construction of the yieldeble jaws 19 and the head with which. it engages serves to permit the two rod members to be adjusted and telescopically connected and to form areliable electrical connection between the two, which will not permit the force exerted in securing the cap to the case to be imparted to the rod and porcelain in. a manner to crack the same as is liable to happen with the construction in my prior patent and other spark plugs of kindred sort.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

A spark plug consisting of a casing which is threaded for attachment to a motor cylinder and having extended sparking points, a removable closure cep upon. the top end. of the casing, two porcelain. members within the casing and inclosed by the seid cap and having elined central holes there- .through, two alined conducting rods one arranged in the hole of each porcelain, one of said rods being provided with a head and the other with a pair of yieldable jaws to telescopically engage the opposite sides of the head to form a self-adjusting telescopic electrical connection for the adjacent ends of the conducting rods.

Signed at Bridgeport in the county of Fail-field and State of Connecticut this 23rd day of January, A. l). 1919.

Lineman lit. Anni 1w 

